Jecross does have a point. If you look at Pardew's last 3 seasons, there are long runs of games (within and between seasons) where the team are either picking up a lot of points, or not many.
Whether there are better explanations than he's a streaky manager (transfers, favourable fixtures, momentum, external factors, etc), or whether this type of occurrence is normal, or if it dates back over his whole career, is a question for people better at stats and with more time on their hands.
However, the pattern does suggest there are probably better explanations than "random variance".
(The column with 1 and 2 refers to first 19 and last 19 games respectively).